Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Schedule of Earnings Per Share Reconciliation

The following table reconciles the numerators and denominators used to calculate basic and diluted earnings per share of common stock:

	Three Months Ended March 31,
(in millions, except per share amounts)	2012		2011
Basic earnings per share:
Net earnings attributable to BorgWarner Inc.	$	158.0	$	124.5
Weighted average shares of common stock outstanding	108.420		110.634
Basic earnings per share of common stock	$	1.46	$	1.13
Diluted earnings per share:
Net earnings attributable to BorgWarner Inc.	$	158.0	$	124.5
Adjustment for net interest expense on convertible notes	5.0		5.2
Diluted net earnings attributable to BorgWarner Inc.	$	163.0	$	129.7
Weighted average shares of common stock outstanding	108.420		110.634
Effect of 3.50% convertible senior notes	11.389		11.389
Effect of warrant	5.813		5.416
Effect of stock-based compensation	2.120		2.785
Total dilutive effect on weighted average shares of common stock outstanding	19.322		19.590
Weighted average shares of common stock outstanding including dilutive shares	127.742		130.224
Diluted earnings per share of common stock	$	1.28	$	1.00
Total anti-dilutive shares:
Call options	6.650		6.312